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Kihwal Lee commented on HADOOP-7854: ------------------------------------ See HADOOP-7831 for the actual exception. > UGI getCurrentUser is not synchronized > -------------------------------------- > > Key: HADOOP-7854 > URL: https://issues.apache.org/jira/browse/HADOOP-7854 > Project: Hadoop Common > Issue Type: Bug > Components: security > Affects Versions: 0.20.205.1 > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Priority: Critical > Attachments: HADOOP-7854.patch > > > Sporadic {{ConcurrentModificationExceptions}} are originating from > {{UGI.getCurrentUser}} when it needs to create a new instance. The problem > was specifically observed in a JT under heavy load when a post-job cleanup is > accessing the UGI while a new job is being processed. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira